1. Andreev, M.P., Akhti, T., Voitsekhovich, A.A., Gagarina, L.V., Gimel’brant, D.E., Davydov, E.A., Konoreva, L.A., Kuznetsova, E.S., Makryi, T.V., Nadeina, O.V., Randlane, T., Saag, A., Stepanchikova, I.S., and Urbanavichyus, G.P., Flora lishainikov Rossii. Biologiya, ekologiya, raznoobrazie, rasprostranenie i metody izucheniya lishainikov (Flora of Lichens in Russia. Biology, Ecology, Diversity, Distribution and Methods of Studying Lichens), KMK, 2013.
2. Andrews, J.T. and Webber, P.J., A lichenometrical study of the northwestern margin of the Barnes Ice Cap. A geomorphological technique, Geogr. Bull., 1964, vol. 22, pp. 80–104.
3. Armstrong, R.A., Seasonal growth and growth rate–colony size relationships in six species of saxicolous lichens, New Phytol., 1973, no. 5, pp. 1023–1030.
4. Armstrong, R.A., Growth phases in the life of a lichen thallus, New Phytol., 1974, vol. 73, pp. 913–918.
5. Beschel, R.E., A project to use Lichens as indicators of climate and time, Arctic, Alpine Res., 1957, p. 60.